6 replies to this topic

[NateDogg2909]

Hi

 

I ended up speaking with my local a series engine chappy and over about 20 mins talking and coming to the conclusion the my 998 build will shift once put back in the car we ended up on the talk of carbs, I said I was sticking with my HIF38 which we both decided would provide a nice spread of torque and power across the full band where as the HIF44 would proberly give a but more in the top end but less pull low down.

 

Now this may sound excessive but I ended up thumbing through david vizards book last night and had a good look at flow rates and produced power using weber carbs on modified cooper 's' engines and they seemed to report good reponse.

 

Would a weber be a good way to go eventually rather that sticking with the HIF38?

 

Full build is

 

A+ 998 block bored to +80

Fully port and flowed 998 head with 1098 inlet/exhaust valves

Keith Calver ROT13 cam (kent 266/276 territory)

 

I will eventually have a lightened flywheel and to this point the bottom end is pretty much standard.

 

Many thanks to any thought given good or bad.

 

Nate

[Dusky]

With 32 or 34mm chokes you can't go wrong.

[Anthony30]

I believe the Weber 40, with a very long manifold, will produce more power higher up in the rev range. With the cam/spec your intending on using, going for a set of twin su carbs would be a better option IMO.

 

Twin HS2/HS4 carbs look far nicer.

Both will sound nice, and produce power, but fitting the Weber will be a pain.

 

[nicklouse]

The Webber is not needed. And they are not really suitable for thst spec.

[slidehammer]

I agree with Nick, and also you will have to modify the bulk head to get it to fit which is a load of work. The SU is a great carb for both power and economy.

[Dusky]

I strongly disagree with a WEBER being unsuitable. A Weber is a very good and quite advanced carb. When it's tuned by someone who knows what he s doing its as good as any carb.

[NateDogg2909]

Cheers it was just a brain fart after looking at what vizard had written in one section about airflow and resulting combustion rates for different engine sizes and it seemed to at least on paper be good compared to su carbs.

Another brain fart was has anyone made a twin turbo A-Series possibly on a 7 or 8 port engine before?